Even with not being able to explain "how" and to appreciate the importance of fax and other mediums even today, the author also failed to mention the fastest mo

Even with not being able to explain "how" and to appreciate the importance of fax and other mediums even today, the author also failed to mention the fastest mode of communication: IM. And the reason why Twitter won't replace email is the same reason why IM can't replace email: Email is a standard with no central ownership. On the otherwise Twitter is a "closed" platform with open API. If you want to twitter, you have to use Twitter (R).